Bad sectors just mean that the hard drive cant write to that particular area. When you run chkdsk it finds those bad sectors then basically locks them away so that the computer doesnt try to write to them again, thus keeping them from causing more problems. The good news is if it is only a few bad blocks your hard drive will be fine, the bad news is that depending on the age of your drive, these errors might just be the tip of the iceberg for a failing hard drive. You might look into getting a new drive and transferring your files over to it if there is anything that you cant easily replace.

Also, go to the website of the drive manufacturer and download the test utilities, if the drive is going bad, you might be able to get it replaced depending on the age.

E:\>^V
'▬' is not recognized as an internal or external command,
operable program or batch file.

E:\>chkdsk /r
The type of the file system is NTFS.
Cannot lock current drive.

Chkdsk cannot run because the volume is in use by another
process. Chkdsk may run if this volume is dismounted first.
ALL OPENED HANDLES TO THIS VOLUME WOULD THEN BE INVALID.
Would you like to force a dismount on this volume? (Y/N) y
Volume dismounted. All opened handles to this volume are now invalid.
Volume label is New Volume.